"You wouldn’t even have the same microbial communities as your identical twin if you had one. So, even identical twins can be up to about 60 or 70 per cent different in terms of the microbial community’s that they harbour." -- Prof Rob Knight - 

See more at: http://upclose.unimelb.edu.au/episode/281-gut-harmony-why-right-mix-microbes-important-our-health#sthash.1iGMKwEL.dpuf